I want to use a Arduino Mega with 20 induction PNP sensors. Some of the cable lengths for the sensors could be around 14 ft. Sensor voltage drop Max. 2.5 VDC @ 200 mA.
Hooking up a couple of sensors with resistors in series and a zener diode I am getting a voltage of 4.23V on the input pin.
Just wanted to know if there any thing i should watch out for. I am currently getting a floating value on a digital read.